4/9+5/9+8/9
Plisss donkk kk

17/9

Step-by-step explanation:

4+5+8/9 ( Because all denominator is same so take 9 as common)

17/9

-3/2

Step-by-step explanation:

5 1/2 - 7 can be done in a variety of ways.  One would be to convert 5 1/2 to 5.5:  then -7 + 5.5 = -1.5.

Or 5 1/2 could be converted to the improper fraction 11/2, from which 7 (converted to 14/2) would be subtracted:  11/2 - 14/2 = -3/2 = -1.5